An infrared reflective barrier type energy-saving automotive sunroof exterior film

Abstract

This utility model relates to the field of exterior film technology, and more particularly to an infrared reflection and blocking type energy-saving automotive sunroof exterior film. From the outside to the inside, it comprises a PET polyester film, a self-healing coating, a buffer support layer, an optical composite layer, an infrared reflective layer, a signal transmission layer, and a structural base layer; the total thickness is 109-1002 μm. This utility model adopts an external application method, which is simpler to install than the traditional internal application method, reduces the possibility of air bubbles during installation, and improves the efficiency and quality of film application. By incorporating the PET polyester film and the self-healing coating, the wear resistance and self-healing ability of the film are effectively improved, reducing aging problems caused by scratches and wear during use, and extending the service life of the film.

Description

Technical Field

[0001] This utility model relates to the field of exterior film technology, and in particular to an infrared reflection blocking type energy-saving automotive sunroof exterior film. Background Technology

[0002] As the new energy vehicle market and industry chain gradually mature, more and more competitive models are being launched, and the proportion of car sunroofs is also increasing. While providing a better experience for drivers, this also leads to increased heat intake, resulting in higher air conditioning energy consumption. Furthermore, the larger glass area poses greater safety hazards during driving. Therefore, it is inevitable that sunroof films, which can eliminate safety hazards, reduce heat intake and lower air conditioning energy consumption, and ensure a good driving experience, will be designed and applied to the automotive industry.

[0003] Existing automotive sunroof films mostly use an internal application method, which is complex to install, and most films perform poorly in terms of infrared blocking and signal shielding. Furthermore, traditional films lack self-healing capabilities and are prone to scratches and aging after long-term use. Therefore, there is an urgent need to design an infrared-reflective, energy-saving external automotive sunroof film to solve the above-mentioned technical problems. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the technical problem of this utility model is to provide an infrared reflection blocking type energy-saving automotive sunroof exterior film.

[0005] The technical solution is: an infrared reflection and barrier type energy-saving automotive sunroof exterior film, which, from the outside to the inside, includes a PET polyester film, a self-healing coating, a buffer support layer, an optical composite layer, an infrared reflection layer, a signal transmission layer, a structural base layer, a pressure-sensitive adhesive layer, and a release film, with a total thickness of 109-1002μm.

[0006] In a preferred embodiment of this invention, the thickness of the PET polyester film is 10-100 μm.

[0007] In a preferred embodiment of the present invention, the self-healing coating is a coating containing a shape memory polymer, and the thickness of the self-healing coating is 2 to 15 μm.

[0008] In a preferred embodiment of this invention, the buffer support layer is a modified TPU film with added impact-resistant filler, and the thickness of the buffer support layer is 50-300 μm.

[0009] In a preferred embodiment of this invention, the optical composite layer is an optical grade acrylic adhesive, and the thickness of the optical composite layer is 5–30 μm.

[0010] In a preferred embodiment of the present invention, the infrared reflective layer is a transparent film made of alternating layers of modified PET resin with added nano-titanium dioxide (TiO2) particles, fluorine-modified polyurethane resin, and acrylic resin doped with tin oxide nanowires, with a thickness of 15-300 μm.

[0011] In a preferred embodiment of this invention, the signal permeable layer is a graphene transparent conductive film with a thickness of 1–2 μm.

[0012] In a preferred embodiment of this utility model, the structural base layer is an optical-grade PET base layer, which is a polyethylene terephthalate film with high light transmittance and good flexibility, and the thickness of the structural base layer is 10-100 μm.

[0013] In a preferred embodiment of this invention, the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer, and the thickness of the pressure-sensitive adhesive layer is 10-100 μm.

[0014] In a preferred embodiment of this invention, the release film is a siliconized PET release film, and the thickness of the release film is 10-100 μm.

[0015] Compared with the prior art, this utility model has the following advantages: 1. This utility model adopts an external application method, which is simpler to construct than the traditional internal application method, reduces the possibility of air bubbles during construction, and improves the efficiency and quality of film application. By setting a PET polyester film and a self-healing coating, the wear resistance and self-healing ability of the film are effectively improved, reducing the aging problems caused by scratches and wear during use, and extending the service life of the film.

[0016] 2. The design of the infrared reflective layer can significantly improve the infrared reflectivity of the film. The optical properties of the three resin layers are complementary. Through the synergistic effect of nanoparticles and nanowires, not only is the infrared reflection effect enhanced, but also the visible light interference loss is minimized by precisely controlling the interlayer refractive index difference. This achieves a perfect balance between high heat insulation and high light transmittance, effectively blocking infrared rays from solar radiation from entering the vehicle, reducing the interior temperature, reducing air conditioning energy consumption, and improving driving comfort.

[0017] 3. The signal transmission layer uses a graphene transparent conductive film, solving the signal shielding problem of traditional films and ensuring the normal operation of the vehicle's wireless communication, navigation, and other functions without affecting the vehicle's intelligent use. The combination of optical-grade PET base layer and adhesive layer ensures that the film can be firmly adhered to the car sunroof glass, while having high light transmittance, not affecting the driver's vision, and improving the driving experience. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0020] Among them: 1-PET polyester film, 2-self-healing coating, 3-buffer support layer, 4-optical composite layer, 5-infrared reflective layer, 51-modified PET resin, 52-fluorinated modified polyurethane resin, 53-acrylic resin layer, 6-signal transmission layer, 7-structural base layer, 8-pressure-sensitive adhesive layer, 9-release film. Detailed Implementation

[0021] The preferred technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] Example: Figures 1-2 As shown, an infrared reflection barrier type energy-saving car sunroof exterior film includes, from the outside to the inside, a PET polyester film 1, a self-healing coating 2, a buffer support layer 3, an optical composite layer 4, an infrared reflection layer 5, a signal transmission layer 6, a structural base layer 7, a pressure-sensitive adhesive layer 8, and a release film 9, with a total thickness of 109-1002μm.

[0023] PET polyester film 1 has a thickness of 10-100μm and features high hardness and strong wear resistance. It can effectively resist external scratches and abrasions, protect the internal structure of the film from damage, and extend the service life of the film. At the same time, the coating has good chemical stability and is not easily corroded by chemicals such as acids and alkalis, ensuring that the film can be used normally in various complex environments.

[0024] Self-healing coating 2 is a coating containing shape memory polymer, which is composed of shape memory polymer, microcapsule repair agent and auxiliary agents. The thickness of self-healing coating 2 is 5-15μm. After being slightly scratched or worn, the shape memory polymer can activate the molecular chain segments when the temperature rises, triggering the shape memory effect and promoting scratch repair. When a scratch occurs, the microcapsules rupture to release repair fluid, which fills the scratch and cures through cross-linking reaction to achieve self-repair. The auxiliary agents improve the hardness and impact resistance of the coating, while enhancing the dispersion stability of the microcapsules. Through the combination of shape memory polymer and microcapsule technology, self-healing coating 2 achieves active scratch repair and long-term maintenance of coating performance.

[0025] The buffer support layer 3 is a modified TPU film with added impact-resistant filler. The thickness of the buffer support layer 3 is 50-300μm, the impact strength of falling ball is >50J, it can absorb the impact energy of stone splashes and other impacts, reduce the risk of sunroof glass breakage, the elongation at break is >500%, and it remains crack-free when the radius of curvature is <20mm, adapting to the curved surface of the sunroof.

[0026] The optical composite layer 4 is made of optical grade acrylic adhesive with a light transmittance of >95% and a refractive index that matches that of the adjacent layers (Δn<0.05). The thickness of the optical composite layer 4 is 5-30μm. The interlayer bonding is strengthened with a peel strength of >5N / cm, ensuring that each functional layer is tightly bonded and will not delaminate during long-term use. This reduces interlayer light scattering, improves visible light transmittance, avoids optical defects such as rainbow patterns, and balances heat insulation and light transmission performance.

[0027] The infrared reflective layer 5 is a transparent film consisting of alternating layers of modified PET resin 51 with added nano-titanium dioxide (TiO2) particles, fluorinated modified polyurethane resin 52, and acrylic resin 53 doped with tin oxide nanowires. The thickness of the infrared reflective layer 5 is 15–300 μm, and the nano-TiO2 particle size is controlled at 20–50 nm. TiO2 has a natural absorption and scattering ability for infrared light. Combined with the high transparency of PET, it can initially block infrared light while maintaining good visible light transmittance. At the same time, the nanoparticles enhance the hardness and wear resistance of the resin, improving the scratch resistance of the reflective film surface. The introduction of fluorine reduces the surface energy of the resin, giving the film excellent hydrophobicity and anti-fouling properties, reducing dust and water stain adhesion. Meanwhile, the fluorinated segments enhance the thermal stability of the resin, improving the anti-aging ability of the reflective film under high-temperature environments. In addition, the flexibility and adhesion of the modified PU resin are further optimized, which can better buffer interlayer stress and promote tight bonding between layers. SnO2 nanowires with an aspect ratio greater than 50 form a conductive network in the resin, giving the reflective film certain electromagnetic shielding and antistatic properties, reducing signal interference and dust adsorption. At the same time, SnO2 nanowires have selective reflective properties for infrared light, which work synergistically with TiO2 in the PET layer to broaden the infrared reflection spectrum range. Furthermore, the high weather resistance and film-forming properties of acrylic resin ensure the stability and optical uniformity of the overall structure.

[0028] Thirty alternating layers are incorporated into a 50μm thick reflective film using an asymmetric gradient strategy. The outer layer is dominated by PET, with a thickness ratio of PET:PU:acrylic = 3:1:1. The middle layer gradually transitions to a higher proportion of PU, with the ratio changing to 1:3:1. The inner layer emphasizes acrylic, with the ratio adjusted to 1:1:3. The thickness of each layer gradually changes according to an exponential function, constructing a three-dimensional refractive index gradient network. This allows infrared light to undergo multiple refractions, reflections, and interferences at the interfaces of different resin layers, combined with the synergistic effect of the three resin components. Compared to the traditional two-layer gradient structure, this results in a 2.6% improvement in light transmittance. Visible light transmittance remains above 78%, while electromagnetic shielding effectiveness reaches 25dB, meeting the requirements of signal transmission and a clean environment for automotive intelligent cockpits.

[0029] The signal transmission layer 6 is a graphene transparent conductive film with a thickness of 1-2 μm. It attenuates 5GHz signals by less than 2 dB. The signal transmission layer 6 uses a graphene transparent conductive film. Graphene has excellent electrical properties and optical transparency, which can ensure that the film has good light transmittance and achieve unobstructed signal transmission. This effectively solves the signal shielding problem of traditional films and ensures the normal operation of vehicle wireless communication, navigation and other functions.

[0030] The structural base layer 7 is an optical-grade PET base layer, which is a polyethylene terephthalate film with high light transmittance and good flexibility. The thickness of the structural base layer 7 is 10-100μm, which can provide stable structural support for the entire film, ensuring the flatness and flexibility of the film, so that it can better fit the car sunroof glass, while having high light transmittance and not affecting the driver's vision.

[0031] The pressure-sensitive adhesive layer 8 is an acrylic pressure-sensitive adhesive layer with a thickness of 6-55 μm. The acrylic pressure-sensitive adhesive has good adhesion properties, which can make the film firmly adhered to the car sunroof glass. It also has good weather resistance and can maintain stable adhesion under different temperature and humidity environments. Furthermore, no glue residue will be left when the film is removed, and it will not damage the car sunroof glass.

[0032] Release film 9 is a silicone PET release film 9 with a thickness of 10-100μm. It prevents the pressure-sensitive adhesive layer 8 from being contaminated or prematurely cured during transportation and storage. It has high light transmittance, making it easy to align and stick, and has a peel force of 5-10g / 25mm.

[0033] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Therefore, all equivalent changes made based on the content described in the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. An infrared reflective barrier type energy-saving automotive sunroof exterior film, characterized in that: From the outside to the inside, it includes a PET polyester film (1), a self-healing coating (2), a buffer support layer (3), an optical composite layer (4), an infrared reflective layer (5), a signal transmission layer (6), a structural base layer (7), a pressure-sensitive adhesive layer (8), and a release film (9), with a total thickness of 109-1002 μm.

2. The energy-saving vehicle sunroof outside-pasting film of claim 1, wherein: PET polyester film (1) has a thickness of 10-100μm.

3. The infrared reflection blocking type energy-saving automotive sunroof exterior film according to claim 2, characterized in that: The self-healing coating (2) is a coating containing shape memory polymer, and the thickness of the self-healing coating (2) is 2 to 15 μm.

4. The energy-saving vehicle sunroof outside-pasting film of claim 3, wherein: The optical composite layer (4) is an optical grade acrylic adhesive, and the thickness of the optical composite layer (4) is 5 to 30 μm.

5. The infrared reflection blocking type energy-saving automotive sunroof exterior film according to claim 4, characterized in that: The signal-transparent layer (6) is a graphene transparent conductive film with a thickness of 1 to 2 μm.

6. The energy-saving vehicle sunroof outside-pasting film of claim 5, wherein: The structural base layer (7) is a polyethylene terephthalate film with high light transmittance and good flexibility, and the thickness of the structural base layer (7) is 10-100 μm.

7. The energy-saving, IR-reflecting, automotive sunroof film according to claim 6, wherein: The pressure-sensitive adhesive layer (8) is an acrylic pressure-sensitive adhesive layer (8), and the thickness of the pressure-sensitive adhesive layer (8) is 6 to 55 μm.

8. The energy-saving, IR-reflective, automotive sunroof film according to claim 7, wherein: The release film (9) is a siliconized PET release film (9), and the thickness of the release film (9) is 10 to 100 μm.

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